Abstract
X-Ray crystal-structure analysis of dihydrofomannosin p-bromobenzoylurethane has led to the elucidation of the structure of fomannosin, a biologically active sesquiterpenoid metabolite of the fungus Fomes annosus. The p-bromobenzoylurethane derivative crystallizes in the monoclinic system, space group P21, with two molecules of C23H24BrNO6 in a unit cell of dimensions a= 11·57, b= 6·05, c= 15·78 Å, β= 95° 35′. The atomic co-ordinates were determined by Fourier and least-squares calculations, the final value of R being 11·2%. The molecule contains a puckered cyclobutane ring with dihedral angle 22°, and a cyclopentanone ring in an envelope conformation.
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